Inverter Radiation Fin Temperature Thermistor Rise Abnormality - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301
3.35 Inverter Radiation Fin Temperature Thermistor Rise
Abnormality
P4
Error Code
Applicable RWEYQ72P, 84P
Models
Method of Error
Resistance of radiation fin thermistor is detected when the compressor is not operating.
Detection
Error Decision When the resistance value of thermistor becomes a value equivalent to open circuited or short
Conditions circuited status
 Error is not decided while the unit operation is continued.
 Defective radiation fin temperature thermistor
Supposed
 Defective inverter PCB
Causes
 Defective inverter compressor
 Defective fan motor
Troubleshooting
Service Diagnosis
P4
" " will be displayed by pressing the inspection button.
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Measure resistance value of
the radiation fin
thermistor
resistance value
normal?
CHECK 11
The INV.
compressor's
insulation resistance is
not more than
100kΩ.
The fan
motor's insulation
resistance is not more
than 1MΩ.
Does the
error recur when the
power supply turns
CHECK 11 Refer to P.250.
Troubleshooting by Indication on the Remote Controller
thermistor.∗
∗ Disconnect the connector (X7A or X111A) from the
radiation fin thermistor, and then check the thermistor.
Is the
NO
YES
YES
NO
YES
NO
YES
ON?
NO
Replace the inverter
PCB.
Replace the
compressor (M1C).
Replace the fan motor.
Replace the inverter
PCB.
Continue the operation.
211